藻类在盐沼湿地分布的关键限制因子研究

The Main Ecological Limiting Factors of Algae Distribution in Salina-alkaline Wetland

藻类是盐沼湿地主要的生物类群,其种类、数量、种群结构与分布直接影响到湿地生态系统的结构和功能。研究结果表明:藻类多样性与离子系数(M/D)、总硬度、钙镁比值相关性高,离子系数、总硬度、钙镁比值成为重要的生态指标。研究数据显示,这3个指标的波动主要是受到钙离子含量变化的影响,该盐沼湿地湖水碳酸根离子含量高,形成碳酸钙沉淀,湖水钙离子含量普遍偏低。所以,钙离子成为限制藻类在鄂尔多斯高原盐沼湿地分布的关键因子。

Algae is a main biological community in salina- alkaline wetland, which the species, quantity, popula- tion structure and distribution directly influence the structure and function of wetland ecosystem. The results show that there is high correlation among ion coefficient （ M/D）, total hardness, calcium - magnesium ratio and algal biodiversity, and ion coefficient（ M/D）, total hardness, calcium -magnesium ratio become important ecological in- dexes. The changes of these three indexes are mainly influenced by the content of calcium ion. The content of car- bonate ion in this salina - alkaline wetland is high, which cause CaCO3 precipitate and low content of calcium ion. Calcium ion is the key factor for limiting the distribution of algae in salina - alkaline wetland in Erdos Plateau.